How do you apply? After oiling or before? How do you smooth it for finish?

Application before oiling is preferred otherwise Bona Gap Master may not stick to surface. Smoothing can be done after application with a wet trowel, a wet sponge, or even a wet finger.. For application on oiled or pre-lacquered surface, slightly sand the areas where the sealant has to be applied.

can this be used on stick down Vinyl floor tiles? attempting camper van conversion and few joints separated over night.

Good Morning, Interesting question, it is designed for use on wood or wall substrates, however it may work for your vinyl floor tiles, I could give no guarantees. I would have to recommend a test area first to check for adhesion to the flooring.

Is this suitable for outdoor use? Also one reviewer said chart is out of sync. I need a light oak any suggestions?

Hi The Bona Gapmaster is designed for use around wooden floors and internal trims. The product is UV stable so will not break down due to exposure to sunlight. That said it is designed for internal usage and does not come with the anti-fungal properties that products designed for damp/wet areas would have. We will be uploading a better chart for colours and request Amazon to add to this listing.

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Gap Master Filler - Black - 310ml

Product ID: 88111540

Details

Brand
Bona
Specific uses for product
floor
Material
Polyacrylate
Item form
Paste
Special feature
Odorless and

⏳18-24h drying time

📏6m coverage per tube

🖤sleek black finish

$43.87

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Description

🖤 Seal the deal with style and precision!

FLEXIBLE DURABLE - 7% elasticity ensures lasting flexibility without cracking, adapting to your home’s natural movements.
SEAMLESS GAP COVERAGE - Covers up to 6 running metres for gaps up to 10mm wide—perfect precision for flawless interiors.
CLEAN SAFE APPLICATION - Odourless and solvent-free formula means no harsh fumes—ideal for indoor use and sensitive environments.
EFFORTLESS STYLE UPGRADE - Matte black polyacrylate material adds a modern, professional edge to your finishing work.
READY FOR THE FINAL TOUCH - Sandable and overcoatable when dry, allowing a perfect finish that blends seamlessly with your décor.

The Bona Gapmaster 310ml is a black, acrylic-based mastic designed for interior gap filling up to 12mm wide. It offers up to 6 metres of coverage per tube, dries within 18-24 hours, and features 7% elasticity for durable flexibility. Odourless, solvent-free, sandable, and overcoatable, it’s the perfect professional-grade solution for sleek, seamless finishes around doors, windows, and skirting boards.

Specifications

Manufacturer	Bona
Part Number	AF4411312000
Product Dimensions	30 x 5 x 5 cm; 997.9 g
Item model number	AF4411312000
Size	310ml
Colour	Black
Material	Polyacrylate
Volume	310 Millilitres
Item Package Quantity	1
Special Features	Odorless, Sandable and overcoatable with floor finishes, Silicone-free
Usage	floor
Batteries included?	No
Batteries Required?	No
Item Weight	998 g

Reviews

A**R

This stuff is amazing, none of the mess of silicone Highly Recommended

Used this to seal the back of worktop, so much easier to work with than silicon which leaves a film over everything. This wipes off with water when applying and looks great.

28.02.2023

S**6

Great for the purpose, chose black for natural effect

Great product, we first tried without applying masking tape on the floorboards and it made a mess. We then taped around the gaps in between floorboards,and applied the product and it turned out neat and clean. We chose black colour, so after the floorboards have been sealed with this product, it still looks natural and if the gap is still there, which is perfect for a natural rustic look. The only one thing I noticed is that it seems to shrink a bit over time, and when fully cured we noticed cracks and gaps here and there. Which we will go over . But overall great product and really recommend!

3.05.2025

D**E

Great for filling gaps between wooden floors

Great product for filling in gaps you get when a wooden floor becomes a bit loose. Easiest way to apply this is to use masking tape either side, then I took the nozzle off and pumped it onto my finger so that I could get more down into the gap giving it a better finish! Remove masking tape after about an hour, looks amazing! I filled my gaps in black as I am going to stain the floor black, do the gaping before staining.

8.04.2020

T**H

Yep, works perfectly

Fantastic stuff, filled the gaps and stayed there.

23.01.2023

C**E

Easy to use, easy to smooth, easy to clean up

Bought because it came in black, to caulk a joint between two dark painted pieces of wood. Worked perfectly for the job. Consistency of regular caulk, easy to clean up with a damp cloth. Easy to smooth into the joint. Hasn’t cracked after 2 months use 👍

25.11.2020

M**R

Time wasted

Disappointed in the product. Impossible to get a continuous bead. Didn't do what it said on the tin !!!

17.12.2017

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$43.87

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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